<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h2>用户登录</h2>
    <form action="login" method="post">
        用户名：<input type="text" name="username" placeholder="用户名"><br>
        密码：<input type="password" name="password" placeholder="密码"><br>
        <input type="submit" value="登录"></input>
    </form>
</body>
</html>